> every developer, company, team, sub-team, etc has their own "library" of random functions, utilities, classes, etc You are right. But my conclusion is differ

> every developer, company, team, sub-team, etc has their own "library" of random functions, utilities, classes, etc You are right. But my conclusion is different. If it is a stable and people have been there for a while then developers know that code as well as the rest. So, when something fails they know how to fix it. Bringing generic libraries may create long callstacks of very generic code (usually templates) that is very difficult to debug while adding a lot of functionality that is never used. Bringing a new library into the code base need to be a though decision.